var _nas = _nas || {};
(function(){
    var nasParams = {cid:102,sid:123,eventID:1};
	var ts = document.createElement("script");
    var s = document.getElementsByTagName("script")[0]; 
	ts.src = "http://tracking.metroo.com.cn/ts/load.js";
    s.parentNode.insertBefore(ts, s);
	if (ts.readyState) {
		ts.onreadystatechange = function() {
			if (ts.readyState == "loaded" || ts.readyState == "complete") {
				_nas.nasLoad("http://tracking.metroo.com.cn", nasParams);
			}
		};
	} else {
		ts.onload = function () {
			_nas.nasLoad("http://tracking.metroo.com.cn", nasParams);
		};
	}
})();